Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1988-11-28
1990-09-18
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318687, 318135, 310 12, 310 13, 34087037, H02K 4100
Patent
active
049581155
ABSTRACT:
There are disclosed both one and two-dimensional, high resolution, brushless DC servomotors that are linear, rotary, planar and cylindrical in nature. All of these employ a capacitive method for deriving the required position and motor commutation information. In suitable circumstances, particularly two-dimensional planar motors on air bearings, the method allows the use of the motor ferromagnetic cores themselves as the capacitive position sensing elements. This leads to a particularly simple and compact type of sevomotor design. In addition, since such motors can move at high speed, there are also disclosed two transformer coupled methods for handling the current drive to the motor windings. Both methods are simple, energy efficient, applicable to motors of any number of phases, and in addition, handle motor direction reversals automatically.
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AT&T Bell Laboratories
Green Geoffery D.
Ip Paul
Shoop Jr. William M.
Wisner W. L.
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